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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.5.2 ConditionType
  HasComponent Variable EnabledState LocalizedText TwoStateVariableType Mandatory HasComponent Variable Quality StatusCode ConditionVariableType Mandatory HasComponent Variable LastSeverity UInt16 ConditionVariableType Mandatory HasComponent Variable Comment LocalizedText ConditionVariableType Mandatory HasProperty Variable ClientUserId String PropertyType Mandatory ... True and for the initial transition of the Retain field from True to False. LastSeverity provides the previous severity of the ConditionBranch . Initially this Variable contains a zero value